Designation:D4787−13(Reapproved2018)StandardPracticeforContinuityVerificationofLiquidorSheetLiningsAppliedtoConcreteSubstrates1ThisstandardisissuedunderthefixeddesignationD4787;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversproceduresthatmaybeusedtoallowthedetectionofdiscontinuitiesinnonconductiveliningsorothernon-conductivecoatingsappliedtoconcretesub-strates.1.2Discontinuitiesmayincludepinholes,internalvoids,holidays,cracks,andconductiveinclusions.1.3Thispracticedescribesdetectionofdiscontinuitiesuti-lizingahighvoltagesparktesterusingeitherpulsedorcontinuousdcvoltage.NOTE1—ForfurtherinformationondiscontinuitytestingrefertoNACEStandardSP0188-2006orPracticeD5162.1.4Thispracticedescribesproceduresbothwithandwith-outtheuseofaconductiveunderlayment.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Foraspecifichazardstatement,seeSection7.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D5162PracticeforDiscontinuity(Holiday)TestingofNon-conductiveProtectiveCoatingonMetallicSubstratesG62TestMethodsforHolidayDetectioninPipelineCoat-ings2.2NACEStandards:3SP0188-2006Discontinuity(Holiday)TestingofProtectiveCoatings3.Terminology3.1DefinitionsofTermsSpecifictoThisSt...
